html, body {
  margin: 0;
  padding: 0;
  font: 12pt "Open Sans", sans-serif;
}

ul {
  background: #60e;
  margin: 0;
  padding: 0;
  list-style-type: none;
  overflow: hidden;
}

ul li {
  float: left;
}

ul li a {
  color: #eaeaea;
  text-decoration: none;
  display: block;
  padding: 14px 16px;
  font: 14pt "Open Sans", sans-serif;
  transition: color 200ms;
}

ul li a:hover {
  color: #fff;
}

.head {
  color: #fff;
  background: linear-gradient(#60e, #92f);
  text-align: center;
  padding: 3em;
}

.numbox_wrapper {
  display: inline-block;
}

button {
  font: 12pt "Open Sans", sans-serif;
  color: #ffffff;
  background: transparent;
  cursor: pointer;
  border: 1.5px solid #ffffff;
  outline: none;
  margin: 12px -3px;
  padding: 8px;
  transition: background 200ms, color 200ms;
}

button:first-child {
  border-radius: 6px 0px 0px 6px;
}

button:last-child {
  border-radius: 0px 6px 6px 0px;
}

button:only-child {
  border-radius: 6px;
}

button:hover {
  background: #ffffff;
  color: #000000;
}

input[type=text] {
  padding: 8px;
  border: none;
  border-radius: 6px;
  text-align: center;
}

input[type=number] {
  text-align: center;
}

input[type=number]::-webkit-inner-spin-button, input[type=number]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.slider_wrapper {
  width: 100%;
}

input[type=range] {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background: #eeeeee;
  outline: none;
  width: 60%;
  height: 10px;
  border-radius: 5px;
}

input[type=range]::-webkit-slider-thumb {
  background: #33aaff;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 20px;
  cursor: pointer;
}

input[type=range]::-moz-range-thumb {
  background: #33aaff;
  -moz-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 20px;
  cursor: pointer;
}
